 Many M1028s were upgraded at the company level to M1028A2 and A3 specs—the dual wheel rear end arrangement was a result of the M1028 flipping on its side because of the high center of gravity when carrying equipment shelters.GM produced some 70,000 CUCVs from 1983 to 1986 (model years were 1984–1987), though most were model year 1984.Chevrolet continued to build CUCVs in low numbers from 1986 to 1996, mainly to accommodate military markets that needed replacements for existing CUCVs.